Oxygen reduction on teflon-bonded carbon electrode①
(School of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, China)
Central South University, Changsha 410083, China)
Abstract: Oxygen reduction on Teflon-bonded carbon gas diffusion electrode without catalyst in 6 mol/L KOH solution was investigated with acimpedance spectroscopy and other electrochemical techniques. The kinetic parameters were measured with an exchange current density ofJ0=3.44×10-9and a Tafel slope of 46 mV/dec in low overpotential range (-0.05 -0.14 V vs SCE), which are comparable with those reported on carbon supported platinum electrode. The reaction mechanism ofOR and the active effect of carbon black were examined.
Key words: oxygen reduction; gas diffusion electrode; acimpedance; chronopotentiometry